Here's a general overview. Specific steps may vary slightly depending on the engine and trim level of your Blazer. Always consult a repair manual specific to your vehicle's year, make, model, and engine for detailed instructions and diagrams. A Haynes or Chilton manual is a good investment.
Tools You'll Likely Need:
* Socket set (metric)
* Ratchet and extensions
* Wrenches (metric)
* Fuel pump pliers (for fuel line clamps)
* Screwdrivers (Phillips and flathead)
* Safety glasses
* Gloves
* Jack and jack stands (essential for safety)
* Wheel chocks
* Fuel line disconnect tool (highly recommended)
* Shop rags
* Torque wrench (to tighten bolts to proper specifications)
* New fuel pump assembly (ensure it's the correct one for your Blazer)
* Possibly a fuel pressure gauge (to check pressure after installation)
General Steps (This is NOT a substitute for a repair manual):
1. Safety First: Disconnect the negative battery terminal.
2. Lower the Fuel Tank: This is usually the most challenging part. You'll need to:
* Consult your repair manual for the exact location of the fuel tank access. This often involves removing parts of the exhaust system, lowering the spare tire (if mounted underneath), and possibly removing other components to gain access to the fuel tank.
* Securely support the fuel tank with jack stands to prevent it from falling. Lowering straps are helpful but often not required. Be careful not to damage fuel lines or electrical wiring.
3. Disconnect Fuel Lines and Electrical Connectors:
* Release fuel pressure: This is crucial to prevent fuel from spraying when you disconnect the lines. Consult your manual for the proper method. Often it involves running the engine until it stalls.
* Carefully disconnect the fuel lines. Use fuel line pliers or a disconnect tool to avoid damaging the lines. Have rags ready to absorb any spilled fuel. Mark the lines to ensure correct reassembly.
* Disconnect the electrical connector to the fuel pump.
4. Remove the Fuel Pump Access Panel: The fuel pump is usually accessed through a cover on the top of the fuel tank. This may involve removing bolts or clamps.
5. Remove the Fuel Pump Assembly: This will involve removing retaining rings, clips, or other fasteners. The pump assembly is typically held in place by a retaining ring or a flange. Pay attention to how it's assembled to ensure proper reinstallation.
6. Install the New Fuel Pump Assembly: Carefully install the new fuel pump assembly, ensuring it's seated correctly. Reattach any retaining rings or clips.
7. Reconnect Fuel Lines and Electrical Connectors: Reconnect the fuel lines, ensuring they are securely clamped. Reconnect the electrical connector.
8. Raise the Fuel Tank: Carefully raise the fuel tank back to its original position.
9. Reconnect Removed Components: Reinstall any components you removed to access the fuel tank.
10. Reconnect Battery Terminal: Reconnect the negative battery terminal.
11. Check for Leaks: Check for any fuel leaks around the fuel lines and connections.
12. Start the Engine: Start the engine and check for any issues. Let the engine run for a few minutes to ensure the fuel pump is working correctly.
13. Check Fuel Pressure (Optional): Using a fuel pressure gauge, check the fuel pressure to ensure it's within specifications.
Important Considerations:
* Fuel System Pressure: Gasoline is under pressure in the fuel system. Take appropriate safety measures and follow the procedures in your repair manual to release this pressure.
* Repair Manual: This is a general overview, not a precise guide. Always consult a repair manual specific to your vehicle.
* Professional Help: If you're not comfortable performing this repair yourself, it's best to take your Blazer to a qualified mechanic. Incorrect installation can lead to serious problems.
This is a complex job; if you're unsure about any step, seek professional help. Improperly performing this repair could result in a fire or other serious damage. Remember safety first!
